Air-mixer for gas-burners.



No. 897,207. 'PATBNTED AUG.' 25,1908. C. H. HBNZEL. AIR MIXER POR GASBURNBRS.

n-APPLICATION FILBI? DEC. 26, 1907'.

2 SHEETS-SHEET 1A.

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No. 897,207. PATENTED AUG. 25, 1908. G. E.- -EENZEL AIE MIXER EOE GASEUENEES.

APPLIGATION FILED DBG. 26, 1907.

2 SHEETS-SHEET 2.

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PATENT oEEioE.

CASPER H. HENZEL, OFHALLEGHENY, PENNSYLVANIA.

AIR-MIXER FOR GAS-BURNERS.

Specification of Letters Patent.

Patented Aug. 25, 1908.

Application med December 26, 1907. serial No. 408,077.

To all whom it may concern:

Be it known that I, CASPER H. H ENZEL, a citizen of the United States ofAmerica, residing at Allegheny, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inAir-Mixers for Gas-Burners, of which the following is a specification,reference being had therein to the accompanying drawing.

This invention relates to air mixers for gas burners, and has for itsobject to provide novel and effective means for regulating andcontrolling the admission of air to a gas burner to effect perfectcombustion and derive a maximum amount of heat from a minimumexpenditure of fuel.

The present invention is an improvement upon my Patent No. 854,497,granted to me May 21st, 1907, the present improvement residing in anovel air mixer by which the efficiency of the heater is increased. Theheater disclosed in the above mentioned patent is particularly designedas a hall heater, wherein gas is used as a heating medium. In thisinvention I employ a similar structure, and provide the burner thereofwith a depending air mixer thatcan be easily and quickly adjusted. Thismixer is adjusted according to the temperature of the compartment inwhich the heater is located, and in this manner I prevent the formationof carbon in the heater and obtain a greater-number of heat units thancould be obtained with any other type of mixer.

The invention will be presently described in detail and thenspecifically pointed out in the claims.

Reference will now be had to the drawing forming a part of thisspecification, wherein:

Figure 1 is a vertical sectional view of a heater constructed inaccordance with my invention, Fig. 2 is an enlarged cross sectional viewof the air mixer illustrating the same in a closed position, Fig. 3 is asimilar view illustrating the air mixer in an open position, Fig. 4 isan elevation of the air mixer, Fig. 5 is a vertical sectional view of alarge air mixer having a plurality of burners, and Fig. 6 is a plan ofthe same.

In the accompanying drawings, 1 designates a frusto-cone-shaped casingsuspended from a box-like structure 2, suitably secured between thejoists 3 of the floor. The boxlike structure carries a conventional formof register 4 and to protect the wood work surrounding the box-likestructure 2 and the register 4, I use asbestos 5 or a similar material.

In the casing 1 is suitably supported a plurality of communicatingdouble frusto coneshaped casings 6, the uppermost casing being while thelowermost casing is supported upon a cone-shaped dome 8. In the dome 8is mounted a perforated burner 9 having a central baflie plate 10 and adeflector 11.

The burner 9 is provided with a depending extension or casing 12 andmounted in said extension or casing is a pipe 13 constituting part ofthe air mixer. reamed to produce circular ribs 14 one near each end ofthe sleeve, and revolubly mounted uponthe said sleeve 13 between saidribs is a sleeve 15 vconstituting a shutter. The sleeve 13 is providedwith a plurality of e ually spaced vertically disposed slots 16. T eshutter 15 surrounding the said sleeve 13 is provided with a pluralityof slots 17 corresponding in size to the slots 16 of the sleeve 13 andadapted to register with said slots. Between the slots 17 of the shutter15 are formed a plurality of openings 18, these openings allowingsufficient air to enter the burner to maintain combustion when theshutter is closed.

The bottom of the sleeve 13 is flanged as at 19 and closed by a plate20, this plate having a central opening for a gas j et 21 and alsohaving a plurality of openings 22 serving functionally the same purposeas the openings 18. The gas jet 21 is connected by a pipe 23 to asuitable supply of gas controlled by a valve 24. v

In Figs. 5 and 6 of the drawings, I have illustrated a large mixer asprovided with a group of burners 9, these burners and mixer beingarranged and designed for large furnaces.

In operation, the air passes into the mixer, and commingling with thegas, passes upwardly to the burner where it is ignited. The products ofcombustion as they pass from the burner strike the inclined walls of thedome 8 and enter the lowermost casing 6 and from thence pass on to eachsucceeding casing 6 until they are finally discharged through theexhaust pipe 7. The free flow of the products of combustion isinterrupted or retarded by the superposed relation of these casings 6,and the construction as fully shown and described in my prior patentprovided with a depending exhaust pipe 7 The sleeve 13 is` heretoforereferred to, tending to cause the casing 6 to become heated and therebygiveo suicient heat to cause the cold air entering the casing 1 to beheated prior to its being discharged through the register 4.

The revoluble shutter l5 can be easily and quickly moved to obtain aproper degree of combustion within the burner 9, the position of theshutter depending upon the temperature of the air in the cellar orcompartment in which the heater is used.

Having now described my invention what l claim as new, isz- An air mixerfor gas burners, comprising in combination with a burner having adepending eXtension, a stationary depending sleeve carried by the burnerextension and provided with a plurality of spaced vertical slots, ribson the exterior of said sleeve adjacent each end thereof7 a perforatedplate secured to the lower end of said sleeve, and a shutter providedwith slots corresponding to the slots in the sleeve andhaving aplurality of air inlet openings between the slots, said shutter mountedfor rotation on the exterior of said sleeve between the ribs on thelatter whereby the slots of the shutter may be moved into and out ofregistry with the slots in the sleeve.

In testimony whereof I afliX my signature in the presence of twowitnesses.

CASPER HENZEL.

Witnesses:

MAX H. SRoLovrTz, C. V. BROOKS.

